The parish church of Caernarvon, 1/2 mile to the SE. of the town, owes its names to Publicus or Peblig, brother of Princess Helena, mother of Roman Emperor Constantine, who was born here. The church dates in part from the fourteenth century. It has an oak roof, and a tower with the unusual feature of stepped battlements. Tradition has it that the father of Constantine, and the Emperor himself, were both buried here.